Simulation of multi-axial compaction of granular media from loose to high relative densities

Procopio, Adam; Zavaliangos, Antonios

doi:10.1016/j.jmps.2005.02.007

Cited by 140 publications

(89 citation statements)

References 58 publications

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“…Knowledge of the bonding surfaces between particles and the stresses/pressures that act at these surfaces, opens up the possibility to study the formation of coherent compacts in detail (Nyström et al, 1993). However, the FE/DE method generally requires quite extensive computational resources, and most studies [also recent ones, such as those by Procopio and Zavaliangos (2005) and by Choi and Gethin (2009)] have therefore been limited to two-dimensional systems.…”

Section: Introductionmentioning

confidence: 99%

Compression mechanics of granule beds: A combined finite/discrete element study

Frenning

2010

Chemical Engineering Science

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Compression of three-dimensional beds comprising of 1000 plastically deforming initially spherical granules is investigated by using the combined finite/discrete element (FE/DE) method. The material model is formulated within the framework of multiplicative plasticity, and utilizes a density-dependent elliptic yield surface that allows porous particles to both deform and to densify plastically, whereas only volume-preserving plastic deformation is possible for nonporous ones. Granules with different characteristics (yield stress and initial porosity) are studied, and the relationship between the single-granule properties and the global compression behaviour of the granule bed is investigated. It is demonstrated that the FE/DE method may shed light on the deformation and densification behaviour of individual granules, since the size and shape of each granule are continually determined as an integral part of the solution procedure, and that the method thus provides a comprehensive picture of the processes occurring during confined compression of granular materials.

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Section: Introductionmentioning

confidence: 99%

Compression mechanics of granule beds: A combined finite/discrete element study

Frenning

2010

Chemical Engineering Science

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“…Granular compaction [1][2][3][4] is an important processing technique used to produce a variety of materials, including pharmaceutical tablets, 5 directionally aligned composite magnets, 6 and nanostructured high-strength metal parts. 7,8 Under dynamic shock-loading conditions, the process of granular compaction has been shown to initiate chemical reactions in reactive powder mixtures.…”

Section: Introductionmentioning

confidence: 99%

Discrete particle simulation of shock wave propagation in a binary Ni+Al powder mixture

Eakins

Thadhani

2007

Journal of Applied Physics

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Numerical simulations of shock wave propagation through discretely represented powder mixtures were performed to investigate the characteristics of deformation and mixing in the Ni+ Al system. The initial particle arrangements and morphologies were imported from experimentally obtained micrographs of powder mixtures pressed at densities in the range of 45%-80% of the theoretical maximum density ͑TMD͒. Simulations were performed using these imported micrographs for each density compact subjected to driver velocities ͑U p ͒ of 0.5, 0.75, and 1 km/ s, and the resulting shock velocity ͑U s ͒ was used to construct the U s -U p equation of state. The simulated equation of state for the 60% TMD mixture was validated by matching results obtained from previous gas-gun experiments. The details of shock wave propagation through the Ni+ Al powder mixtures were explored on several scales. It is shown that the shock compression of mixtures of powders of dissimilar densities and strength is associated with heterogeneous deformation processes leading to focused flow, particulation, and vortex formation, resulting in local fluctuations in pressure and temperature, which collectively are responsible for highly irregular "shock" fronts and unstable high-pressure states in granular media.

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“…Furthermore the particles were also subjected to triaxial loading conditions and simulation results were used to develop a cap-plasticity model for the particles [42]. Zhang modeled particle interaction with a mixture of hard and 40% soft particles [43].…”

Section: Combined Fem/dem Approachmentioning

confidence: 99%

“…During this simulation it needs to be ensured that particles don't undergo significant plastic deformation [42,43].…”

Section: Literature Survey On Pack Configurationmentioning

confidence: 99%

Mechanics of light weight proppants: A discrete approach

Kulkarni¹,

Ochoa²

2012

Composites Science and Technology

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Proppants are a specific application of granular materials used in oil/gas well stimulation. Employment of hard and soft particle mixtures is one of the many approaches availed by the industry to improve fracture resistance and the stability of the granular pack in the hydraulic fracture. Current industrial practices of proppant characterization involve long term and expensive conductivity tests. However, the mechanics governing the proppant pack response, in particular the effects due to material, shape and size of particles on the pack porosity, stiffness and particle fragmentation are not understood clearly.The present research embodies analytical and experimental approach to model hard (ceramic) and soft (walnut shell and/or pure aluminum) proppant mixtures by taking into account polydispersity in size, shape and material type of individual particles.The hydraulic fracture condition is represented through confined compression and flowback loads. The particle interactions clearly illustrate changes in pore space as a function of pressure, mixture composition and friction. Single particle compression tests on individual particles are carried out to obtain mechanical properties which are incorporated into the finite element models and are further correlated with the compression/crush response of the mixture. The proppant pack stiffness and particle fragmentation depends strongly on the mixture composition as illustrated in the models and experiments. The flowback models demonstrated that the formation of a stable arch is essential to pack stability. Additional variables that enhance flowback resistance are identified as; addition of softer particles to a pack, softer rock surfaces and higher interparticle friction. The computational studies also led to the discovery of better, and more iv efficient pack compositions such as -short and thin pure Al needles/ceramic and the pistachio shells/ceramic mixtures. These analytical results have generated great interest and are engaged in the design of experiments to formulate future proppant pack mixtures at Baker Hughes Pressure Pumping, Tomball, TX. v

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Simulation of multi-axial compaction of granular media from loose to high relative densities

Cited by 140 publications

References 58 publications

Compression mechanics of granule beds: A combined finite/discrete element study

Compression mechanics of granule beds: A combined finite/discrete element study

Discrete particle simulation of shock wave propagation in a binary Ni+Al powder mixture

Mechanics of light weight proppants: A discrete approach

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